Amplify-and-Forward Cooperative Transmission with Multiple Relays Using Phase Feedback

Cooperative transmission obtains the spatial diversity gains created by sharing antennas of terminals in wireless networks. Although the amplify-and-forward (AF) cooperative transmission has the advantages of low implementation complexity and simplicity compared to the decode-and- forward (DF) cooperative transmission, studies on the AF cooperative transmission with multiple relays have not been sufficiently investigated. In this paper, we introduce the AF cooperative transmission with multiple relays using phase feedback. Simulation results show that the proposed schemes obtain the diversity gain according to the number of the cooperating terminals. The performance of proposed scheme using tolerable quantized feedback is close to that of proposed scheme using full feedback.